When it arrived, I liked it so much that I immediately bought more, but nothing over $25 for quite a while. I think I'd been collecting about 6-8 months when I bought a cel for $116, while everything else in my collection was still under $25... I really felt like I was splurging! I couldn't believe I'd just spent over $100 for a cel, but it is beautiful and I had to have it. 
Then once that $100 barrier was gone, after I'd been collecting about a year, I bought a cel for $300. That's still the most expensive cel in my gallery, but only until I get my dream Urd cel paid off (she's my avatar). 
The cel I've felt most guilty about was my Cutey Honey pan cel. I paid what I consider a good chunk of change for it (I'm a poor college student, so probably to others it wouldn't be considered expensive), but I've never seen the series (and know nothing about it), I just really love the image. I'd told myself that I wouldn't buy cels for over $10 if I'd not seen the anime they were from... but that only lasted so long.
I guess I've become a cel collector, rather than an anime collector who collects cels. Yeah. 
I get cels with images that I like, or characters that I like, where there's just something about the cel that draws me to it. To this day the cels I buy are a range of prices, in fact I just bought a cel on ebay for $3.
Congratulations UrdNoDa!! You scored one of the most gorgeous Urd cels I've ever seen. And I know just where you got it too. Ms. Poe has only THE most incredible cels. I couldn't resist buying a few from her myself. 
Slow and steady wins the race (uhh... sometimes) and she'll be 100% mine soon!